nVidia 471.96 and DXGI_DEVICE_HUNG resolved

[Ray Proudfoot 8,945]

East of Oklahoma City enroute to Dallas / FW from Chicago and had my first freeze / buzz for a few seconds in days. This is what the GPU load looked like.

[psolk 3,040]

8 minutes ago, Ray Proudfoot said:

East of Oklahoma City enroute to Dallas / FW from Chicago and had my first freeze / buzz for a few seconds in days. This is what the GPU load looked like.

That looks just like my blood pressure graph when I keep fainting 😉   Big drop then massive spike LOL.  

So what happened in the background is the question... 

[shermank 170]

Think of the medical bills we can save….P3D can replace need for EKG tests

sherm

 

[kevinfirth 1,393]

34 minutes ago, Ray Proudfoot said:

East of Oklahoma City enroute to Dallas / FW from Chicago and had my first freeze / buzz for a few seconds in days. This is what the GPU load looked like.

Something interrupted the CPU load which caused the FPS to drop.  The GPU had no work to do because P3D was running at a very low framerate, then it had to work like hell to catch up!

[Ray Proudfoot 8,945]

Gents, thanks for your analysis. I probably had a similar scare the first time it happened but not now as I know the situation will recover.

Paul, no idea what happened in the background. Nothing in Event Viewer. It remains a mystery. I must have flown for nearly 3.5hrs with loads of Ai and no issues. At the time this happened I was around 150nm out of KDFW in heavy storms. Maybe a factor.

[Sabre57 46]

Ray,

What was your CPU load at the time of the spike?

[Ray Proudfoot 8,945]

7 minutes ago, Sabre57 said:

Ray,

What was your CPU load at the time of the spike?

Don’t know, sorry. It takes time to save the screenshot before I can take another. You don’t get much time before the info scrolls off screen.

[Sabre57 46]

No worries

[Ray Proudfoot 8,945]

17 minutes ago, Sabre57 said:

No worries

If the CPU load didn’t change would that suggest a graphical problem only affecting the GPU and perhaps pointing to a DXGI issue hidden by the Registry entries?

[Sabre57 46]

1 hour ago, Ray Proudfoot said:

If the CPU load didn’t change would that suggest a graphical problem only affecting the GPU and perhaps pointing to a DXGI issue hidden by the Registry entries?

Possibly.  My original thought was triggered by what Kevin said above that if the CPU was maxed out at the same time it may have been part of the cause.  I've read of power issues or lack of enough power, creating these kinds of issues as well.  The registry entries cured my DXGI issue and I don't have any lingering symptoms and my GPU was a lowly 970. My guess, and it's purely a guess, is that whatever is triggering it is random and outside of the sim.

[kevinfirth 1,393]

I've had a similar issue recently, but not exactly the same.  Running rtss I could see I experienced a cycle of serious stutters, where the CPU load momentarily went to 100% on all cores. At the same time the framerate tanked from 50 to 5, with GPU use at 0%, so demonstrating everything was CPU bottlenecked.  Then a second later it recovered and went back to smooth well timed 50fps.  I spent about a week trying to determine the cause, it wasn't airplane, scenery, location or add-on specific.  In the end the apparent solution was just to delete the P3D.cfg and let the SIM rebuild it.  Why did that cause my stutters? No idea....

[Ray Proudfoot 8,945]

@Sabre57, if it is something external it seems a huge coincidence it’s started after the Registry entries. I’m going to remove them and see what happens.

@kevinfirth, was that on every flight?

[kevinfirth 1,393]

1 hour ago, Ray Proudfoot said:

@kevinfirth, was that on every flight?

Yes it was, until I rebuilt the cfg.

At one point I noticed in task manager that Couatl was consuming an excessive amount of power and thought I'd fixed it by terminating the service.  However I couldn't reproduce that afterwards and the cfg rebuild seemed to fix the issue.  

 

[psolk 3,040]

11 hours ago, Sabre57 said:

Possibly.  My original thought was triggered by what Kevin said above that if the CPU was maxed out at the same time it may have been part of the cause.  I've read of power issues or lack of enough power, creating these kinds of issues as well.  The registry entries cured my DXGI issue and I don't have any lingering symptoms and my GPU was a lowly 970. My guess, and it's purely a guess, is that whatever is triggering it is random and outside of the sim.

Totally random thought but what are your windows security settings?  I "thought" mine were disabled until I started having random issues with the sim.  Never a DX issue but every time my sim choked, sputtered or died inevitably Windows Security was kicking in.  Specifically Virus and Threat protection.  This despite me "thinking" they were disabled.  It could happen once a week, once every couple of weeks but whenever I had a sim issue it would turn out Virus and Threat Protection was updating itself and running a scan.   I've set exclusions, defined implicit deny policies but it seems MS won't listen.  I've now reverted to doing a "quick scan" before my sim flights to ensure it does not randomly happen mid flight.  Typically the only time my system is on is for Flightsim so there were no down periods when FS wasn't running for the scans to happen I guess.  

[RobPol471 173]

Hi Paul,

During operation, Windows starts various checks at predetermined times which obviously can slow down the running programs.

You can check these controls by searching for:

  Utility of start - Task Scheduler Library - Microsoft - Windows.

By clicking on the folders shown you can disable the checks that Windows starts up as for example in the DiskCleanup and DiskDiagnostic folders.